tridentfb: fix pseudo_palette array overrun in setcolreg

The pseudo_palette has only 16 elements. Do not write if regno (the array
index) is more than 15.
Signed-off-by: NAntonino Daplas <adaplas@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/tridentfb.c

@@ -976,7 +976,7 @@ static int tridentfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 		return 1;
 
 
-	if (bpp==8) {
+	if (bpp == 8) {
 		t_outb(0xFF,0x3C6);
 		t_outb(regno,0x3C8);
 
@@ -984,7 +984,8 @@ static int tridentfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 		t_outb(green>>10,0x3C9);
 		t_outb(blue>>10,0x3C9);
 
-	} else if (bpp == 16) {	/* RGB 565 */
+	} else if (regno < 16) {
+		if (bpp == 16) {	/* RGB 565 */
 			u32 col;
 
 			col = (red & 0xF800) | ((green & 0xFC00) >> 5) |
@@ -997,6 +998,7 @@ static int tridentfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 				((red & 0xFF00) << 8) 		|
 				((green & 0xFF00))		|
 				((blue & 0xFF00)>>8);
+	}
 
 //	debug("exit\n");
 	return 0;